WP-72-09 Datasheet, PDF (1/5 Pages) Cymbet Corporation – Non-Cytotoxic Rechargeable Batteries for Medical Devices

White Paper:
Non-Cytotoxic Rechargeable
Batteries for Medical Devices
New Solutions for Powering Medical Devices
Small medical sensors and surgical instruments are rapidly becoming intelligent and
therefore they must be powered - often using miniature rechargeable batteries.
Integrated batteries must have several key properties in order to insure safe
operation and protect patient health. New solid state batteries have been introduced
that are uniquely fabricated using standard semiconductor manufacturing processes
and packaging techniques.
In order to meet the requirements of new medical sensors and smart instruments,
several factors must be considered:
• Innovative battery packaging and connectivity options must be available
• Integrated batteries must be completely non-cytotoxic
• Batteries must support heat-sterilization processes
• Various battery charging methods, including Energy Harvesting may be used
• Small size: medical sensing technologies are becoming millimeter-scale
Innovative Battery Packaging and Connectivity
Solid state batteries have the same handling and die attach mechanisms as the other
integrated circuits found in medical electronic devices. This makes solid state
batteries ideal for co-packaging with other ICs to create advanced Systems-in-
Package (SIP) devices. An example of the use of a solid state battery wire bond
attachment in an IC stack is shown in Figure 1:
Figure 1: Solid State Battery wire bond attachment in IC stack
The rechargeable solid state battery is the second layer and wire bonds to the Vout
and GND pads are shown. This device stack is the actual implementation used in the
Intraocular Pressure Sensor described later in this article. Solid state batteries are
also available packaged in standard plastic DFN semiconductor packages that ship on
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